# When to start descent

Hello again Infinite Flight Community, I just wondered if anyone had an easy and quick way to calculate when to start my decent. Wether that’s mental arithmetic or an app i dont mind. I never know when to start my decent and I always end up pitching down and that can sometimes lead to a crash. I just dont know. Thanks😁

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cruise -( airport elevation + 3000) : V/S= minutes i have to descent

This is how i do it

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There’s a Swiss 001 video on it on how to land well and do a good approach

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And how much earlier should you do it if there is approach at the airport?

Again watch the video

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This might help too:

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I will try to get my head around that one

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There’s a bunch of tutorials on the forum… the one above, etc. The search bar is helpful too.

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Been many many topics on this recently, always remember to use that search bar!

As a very quick guide ( please have a look at the other topics on this!) take your Flight level, devide by 3 and you get the DTG (distance to go) when to start your descent.

Ie 35000ft = FL350
350/3 = 116

so start at least 116nm from your destination.

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You can also use a descent calculator ;)

Here’s one that I use:

http://aerotexas.com/desplan/desplan.php

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The formula for it isn’t that hard it’s just;
TOD= (Alt/Rod)*(Gs/60)
Pick a rate of descent you like
Alt= Altitude
Rod= Rate of descent
Gs= Ground speed

If you want to know how fast to descend from a certain distance then;
Rod= (Gs/60)*(Ft/Nm)
Ft/Nm= Altitude loss needed divided by the distance to destination.

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